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export namespace Client {
  export function isTouchDevice():boolean {
    return window.matchMedia('screen and (max-width: 480px)').matches
                && (('ontouchstart' in window) || window['DocumentTouch'] && document instanceof 
        DocumentTouch)
  }
}

    const h = Math.floor(v / 3600);
    const m = Math.floor((v % 3600) / 60);
    const s = v % 60;
    const lz = (v:number) => v < 10 ? `0${v.toFixed()}` : v.toFixed();
    return `${lz(h)}:${lz(m)}:${lz(s)}`;

// signature:
URL.join(...items:Array<string>):string

console.log(URL.join('/foo/', '/bar/'))
// produces: /foo/bar/

export function head<T>(data:Array<T>):T;
export function head<T>():(data:Array<T>)=>T;
export function head<T>(data?:Array<T>):any {
  // implementation...
}

export function tail<T>(data:Array<T>):Array<T>;
export function tail<T>():(data:Array<T>)=>Array<T>;
export function tail<T>(data?:Array<T>):any {
  // implementation...
}

const v = List.head([0, 1, 2, 3, 4]);
// v is 0

const t = List.tail([0, 1, 2, 3, 4]);
// t is [1, 2, 3, 4]